Not really cool to edit grub.cfg. Those changes should go into /etc/default/grub.
GRUB_CMDLINE_LINUX="rd.md=0 rd.lvm=0 rd.dm=0 SYSFONT=True KEYTABLE=us rd.luks=0 LANG=en_US.UTF-8 rhgb quiet"
Change that line and then run
grub2-mkconfig -o /boot/grub2/grub.cfg
Guess this won't help much if your system won't boot. Reboot with the install DVD and reinstall grub.